Units were installed to replace out dated Firex units. Recently one of the Co2 alrms has gone off multiple times. Fire department has checked house and has not found any CO2 levels.....This happened last Friday and now today it went off nine times. House was checked again and found no level of CO2 present. this is in a daycare so it is very disssruptive! Any ideas as to why this is occuring??

I was trying to find out how old my Firex Smoke Alarm is. There is a recall notice on the web for another Firex product. It implies that the date code 98149 means the 149th day of 1998.

Amen!

Sorry but I was misinformed and gave the wrong information and I am taking it off.

Check that you have no CO2 coming from the gas heater exhaust getting into the house. The heating guy should have a meter to check for CO2. High levels of CO2 are very very dangerous.

He said it had a new battery so he already did that and why would you service a $12 throw away smoke alarm? This FIREX he identified is the 4618 and will also chirp while the LED light blinks, chirp is about 30 seconds after blink if the unit itself needs to be replaced because there is something wrong with it as opposed to a different chirp pattern for battieries. If still unerwarrantee FIREX will replace otherwise go buy a new one.

Propane is heavier than air so if the detector is mounted ABOVE the appliances that use it (or any tubing that brings the propane into the house) it (the propane) will NOT be detected, even if there is a leak. That said, the PRODUCTS OF COMBUSTION of a propane appliance will still contain carbon monoxide (CO) which is lighter than air and will be detected by a properly installed detector. If you continue to get alarms and readings that differ from each other, along with no error codes on the display, it sounds like the detector is really detecting something. If the fire department cannot identify a source, try calling the Kidde "Hotline" at 1-800-880-6788 and ask if they can recommend another agency in your area to check your premises. I don't think these units detect Radon but am not sure. If your dwelling is of relatively new construction, the problem can be complicated by the fact that there is less outside air infiltration to disperse any build-up of gas/radon/CO/etc. than is typical in older construction. *Disclaimer: I am not a lawyer, despite the handle. Words to live by: "Every creative act results from a sudden cessation of stupidity." -Edwin H. Land, inventor of the Polaroid Land Camera"The problem can always be solved with the materials in the room." -My college Physics Lab

Turn of the hot water valve and turn on a hot water tap in the house. If You have water flow, then you have a problem with a faucet (usually a shower valve). Go to the shower valve and see if you hear water running. If so that is likely the problem. Otherwise there is not enough gas to fire the unit that far and it will fail out. Check the manual most people install these units wrong. If you install it to code then you did it right. If you install it to the manufacturer's specs, you installed it to code and it is right. Then the only adjustment is with a Calibrated CO2 analyzer (instructions in the manual).

In series, I think parallel is the way it should be.
Series would reduce the voltage to each one - I think that's not right.

your thinking along the right line, combo units seldom work as single function units. keep in mind that a CO detector need to be replaced every 5 years on average. look at the date code on the new unit to make sure it reads good until or replace by 2012 of better.

mj

call sanyo tech department and they will help you increase the fan speed to cool the unit. This is done with the remote so it was pretty easy. Make sure your filters are very clean first (use compressed air or a co2 canister. Have not had a problem since, my units run on average 8 hours a night and have not shut down.